Mercury – Inlet Water Hose for MerCruiser MR, Alpha One and Gen II Transoms | Cooling System Component | Molded Marine Rubber | 8M0215001

Overview

There’s a certain confidence that comes from knowing your engine is getting the cooling water it needs, especially when the afternoon sun is beating down and you’re running across choppy water with a full boat. The inlet water hose might not look like much at first glance, but it plays an important role in keeping your MerCruiser drive healthy and steady. When it’s in good shape, you feel it in the engine’s calm, even tone as you throttle up. That steady hum brings peace of mind — the kind that lets you enjoy the ride, the company and the open water without worrying about what’s happening inside the transom assembly.

Key Features

• Direct-fit Mercury Marine part for the engine’s cooling water intake path
• Molded marine-grade rubber hose for durability and flexibility
• Designed to maintain shape under pressure, heat and constant water exposure
• Smooth interior for consistent water flow
• Resistant to cracking, swelling and long-term degradation
• Mercury Marine part number 8M0215001
• Fits MerCruiser MR, Alpha One and Gen II transom assemblies

Engine & Boat Compatibility

• Designed for MerCruiser MR sterndrives
• Fits MerCruiser Alpha One sterndrives
• Fits MerCruiser Alpha One Gen II transoms
• Common on runabouts, bowriders, small cruisers, fishing boats and family sport boats
• Ideal for vessels that rely on consistent cooling water flow during long runs or heavy load conditions

Performance & Practical Benefits

A dependable cooling hose makes a noticeable difference in how your engine behaves. This molded rubber inlet hose delivers a steady stream of water from the outdrive into the cooling system, helping the engine maintain safe operating temperatures even during tough conditions. You’ll notice a smooth, confident engine response, especially when accelerating onto plane or idling for long stretches while waiting for the tide.

Because the hose is molded specifically for Mercury transoms, the fit is tight, secure and free of awkward bends that can restrict water flow. That smooth interior helps prevent turbulence and keeps the system breathing easily. The marine-grade rubber resists UV light, saltwater exposure and vibration — the kinds of challenges that usually wear hoses down over time. Instead of worrying about cracking or soft spots, you get a part that stays strong season after season. Maintenance becomes simpler, and you reduce the risk of overheating caused by collapsed or weakened hoses.

Why Buy OEM

Cooling system components need to be right the first time. A genuine Mercury Marine part ensures proper hose length, wall thickness and curvature — details aftermarket manufacturers often fail to match precisely. When the fit is even slightly off, you can end up with water flow issues, leaks or premature hose failure. With an OEM hose, you know it was designed for the exact transom geometry of your MerCruiser drive and tested under real boating conditions. Choosing the original part is simply the practical, cost-effective approach. It keeps your engine protected, your time on the water uninterrupted and your maintenance predictable.

FAQ

Q1: Which engines or systems does the Inlet Water Hose 8M0215001 fit?

It fits MerCruiser MR, Alpha One and Alpha One Gen II transom assemblies.

Q2: What makes this hose better than aftermarket alternatives?

The molded marine rubber, precise curvature and OEM specifications provide superior durability and consistent water flow.

Q3: How do I know if this is the correct hose for my setup?

If your boat uses a MerCruiser MR, Alpha One or Gen II sterndrive, this is the correct Mercury Marine part number.

Q4: Can this be used in both saltwater and freshwater?

Yes — it’s built for long-term reliability in either environment.

Q5: Is installation straightforward for most boat owners?

Most owners comfortable with sterndrive maintenance will find it installs easily with basic tools.